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Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Synthesis of Directional Sources Using Wave Field Synthesis, Possibilities, and Limitations | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2007 Article ID 90509 18 pages doi 10.1155 2007 90509 Research Article Synthesis of Directional Sources Using Wave Field Synthesis Possibilities and Limitations E. Corteel1 2 1IRCAM 1 Place Igor Stravinsky 75004 Paris France 2 Sonic Emotion Eichweg6 8154 Oberglatt Switzerland Received 28 April 2006 Revised 4 December 2006 Accepted 4 December 2006 Recommended by Ville Pulkki The synthesis of directional sources using wave field synthesis is described. The proposed formulation relies on an ensemble of elementary directivity functions based on a subset of spherical harmonics. These can be combined to create and manipulate directivity characteristics of the synthesized virtual sources. The WFS formulation introduces artifacts in the synthesized sound field for both ideal and real loudspeakers. These artifacts can be partly compensated for using dedicated equalization techniques. A multichannel equalization technique is shown to provide accurate results thus enabling for the manipulation of directional sources with limited reconstruction artifacts. Applications of directional sources to the control of the direct sound field and the interaction with the listening room are discussed. Copyright 2007 E. Corteel. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. INTRODUCTION Wave field synthesis WFS is a physics-based sound reproduction technique 1-3 . It allows for the synthesis of wave fronts that appear to emanate from a virtual source at a defined position. WFS thus provides the listener with consistent spatial localization cues over an extended listening area. WFS mostly considers the synthesis of virtual sources exhibiting omnidirectional directivity characteristics. However the directive properties of sound sources .
